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                                <section class="normal markdown-section">
                                
                                <h1 id="&#x9519;&#x8BEF;&#x5904;&#x7406;&#x673A;&#x5236;">&#x9519;&#x8BEF;&#x5904;&#x7406;&#x673A;&#x5236;</h1>
<h2 id="error-&#x5B9E;&#x4F8B;&#x5BF9;&#x8C61;">Error &#x5B9E;&#x4F8B;&#x5BF9;&#x8C61;</h2>
<p>JavaScript &#x89E3;&#x6790;&#x6216;&#x8FD0;&#x884C;&#x65F6;&#xFF0C;&#x4E00;&#x65E6;&#x53D1;&#x751F;&#x9519;&#x8BEF;&#xFF0C;&#x5F15;&#x64CE;&#x5C31;&#x4F1A;&#x629B;&#x51FA;&#x4E00;&#x4E2A;&#x9519;&#x8BEF;&#x5BF9;&#x8C61;&#x3002;JavaScript &#x539F;&#x751F;&#x63D0;&#x4F9B;<code>Error</code>&#x6784;&#x9020;&#x51FD;&#x6570;&#xFF0C;&#x6240;&#x6709;&#x629B;&#x51FA;&#x7684;&#x9519;&#x8BEF;&#x90FD;&#x662F;&#x8FD9;&#x4E2A;&#x6784;&#x9020;&#x51FD;&#x6570;&#x7684;&#x5B9E;&#x4F8B;&#x3002;</p>
<pre><code class="lang-javascript"><span class="hljs-keyword">var</span> err = <span class="hljs-keyword">new</span> <span class="hljs-built_in">Error</span>(<span class="hljs-string">&apos;&#x51FA;&#x9519;&#x4E86;&apos;</span>);
err.message <span class="hljs-comment">// &quot;&#x51FA;&#x9519;&#x4E86;&quot;</span>
</code></pre>
<p>&#x4E0A;&#x9762;&#x4EE3;&#x7801;&#x4E2D;&#xFF0C;&#x6211;&#x4EEC;&#x8C03;&#x7528;<code>Error</code>&#x6784;&#x9020;&#x51FD;&#x6570;&#xFF0C;&#x751F;&#x6210;&#x4E00;&#x4E2A;&#x5B9E;&#x4F8B;&#x5BF9;&#x8C61;<code>err</code>&#x3002;<code>Error</code>&#x6784;&#x9020;&#x51FD;&#x6570;&#x63A5;&#x53D7;&#x4E00;&#x4E2A;&#x53C2;&#x6570;&#xFF0C;&#x8868;&#x793A;&#x9519;&#x8BEF;&#x63D0;&#x793A;&#xFF0C;&#x53EF;&#x4EE5;&#x4ECE;&#x5B9E;&#x4F8B;&#x7684;<code>message</code>&#x5C5E;&#x6027;&#x8BFB;&#x5230;&#x8FD9;&#x4E2A;&#x53C2;&#x6570;&#x3002;&#x629B;&#x51FA;<code>Error</code>&#x5B9E;&#x4F8B;&#x5BF9;&#x8C61;&#x4EE5;&#x540E;&#xFF0C;&#x6574;&#x4E2A;&#x7A0B;&#x5E8F;&#x5C31;&#x4E2D;&#x65AD;&#x5728;&#x53D1;&#x751F;&#x9519;&#x8BEF;&#x7684;&#x5730;&#x65B9;&#xFF0C;&#x4E0D;&#x518D;&#x5F80;&#x4E0B;&#x6267;&#x884C;&#x3002;</p>
<p>JavaScript &#x8BED;&#x8A00;&#x6807;&#x51C6;&#x53EA;&#x63D0;&#x5230;&#xFF0C;<code>Error</code>&#x5B9E;&#x4F8B;&#x5BF9;&#x8C61;&#x5FC5;&#x987B;&#x6709;<code>message</code>&#x5C5E;&#x6027;&#xFF0C;&#x8868;&#x793A;&#x51FA;&#x9519;&#x65F6;&#x7684;&#x63D0;&#x793A;&#x4FE1;&#x606F;&#xFF0C;&#x6CA1;&#x6709;&#x63D0;&#x5230;&#x5176;&#x4ED6;&#x5C5E;&#x6027;&#x3002;&#x5927;&#x591A;&#x6570; JavaScript &#x5F15;&#x64CE;&#xFF0C;&#x5BF9;<code>Error</code>&#x5B9E;&#x4F8B;&#x8FD8;&#x63D0;&#x4F9B;<code>name</code>&#x548C;<code>stack</code>&#x5C5E;&#x6027;&#xFF0C;&#x5206;&#x522B;&#x8868;&#x793A;&#x9519;&#x8BEF;&#x7684;&#x540D;&#x79F0;&#x548C;&#x9519;&#x8BEF;&#x7684;&#x5806;&#x6808;&#xFF0C;&#x4F46;&#x5B83;&#x4EEC;&#x662F;&#x975E;&#x6807;&#x51C6;&#x7684;&#xFF0C;&#x4E0D;&#x662F;&#x6BCF;&#x79CD;&#x5B9E;&#x73B0;&#x90FD;&#x6709;&#x3002;</p>
<ul>
<li><strong>message</strong>&#xFF1A;&#x9519;&#x8BEF;&#x63D0;&#x793A;&#x4FE1;&#x606F;</li>
<li><strong>name</strong>&#xFF1A;&#x9519;&#x8BEF;&#x540D;&#x79F0;&#xFF08;&#x975E;&#x6807;&#x51C6;&#x5C5E;&#x6027;&#xFF09;</li>
<li><strong>stack</strong>&#xFF1A;&#x9519;&#x8BEF;&#x7684;&#x5806;&#x6808;&#xFF08;&#x975E;&#x6807;&#x51C6;&#x5C5E;&#x6027;&#xFF09;</li>
</ul>
<p>&#x4F7F;&#x7528;<code>name</code>&#x548C;<code>message</code>&#x8FD9;&#x4E24;&#x4E2A;&#x5C5E;&#x6027;&#xFF0C;&#x53EF;&#x4EE5;&#x5BF9;&#x53D1;&#x751F;&#x4EC0;&#x4E48;&#x9519;&#x8BEF;&#x6709;&#x4E00;&#x4E2A;&#x5927;&#x6982;&#x7684;&#x4E86;&#x89E3;&#x3002;</p>
<pre><code class="lang-javascript"><span class="hljs-keyword">if</span> (error.name) {
  <span class="hljs-built_in">console</span>.log(error.name + <span class="hljs-string">&apos;: &apos;</span> + error.message);
}
</code></pre>
<p><code>stack</code>&#x5C5E;&#x6027;&#x7528;&#x6765;&#x67E5;&#x770B;&#x9519;&#x8BEF;&#x53D1;&#x751F;&#x65F6;&#x7684;&#x5806;&#x6808;&#x3002;</p>
<pre><code class="lang-javascript"><span class="hljs-function"><span class="hljs-keyword">function</span> <span class="hljs-title">throwit</span>(<span class="hljs-params"></span>) </span>{
  <span class="hljs-keyword">throw</span> <span class="hljs-keyword">new</span> <span class="hljs-built_in">Error</span>(<span class="hljs-string">&apos;&apos;</span>);
}

<span class="hljs-function"><span class="hljs-keyword">function</span> <span class="hljs-title">catchit</span>(<span class="hljs-params"></span>) </span>{
  <span class="hljs-keyword">try</span> {
    throwit();
  } <span class="hljs-keyword">catch</span>(e) {
    <span class="hljs-built_in">console</span>.log(e.stack); <span class="hljs-comment">// print stack trace</span>
  }
}

catchit()
<span class="hljs-comment">// Error</span>
<span class="hljs-comment">//    at throwit (~/examples/throwcatch.js:9:11)</span>
<span class="hljs-comment">//    at catchit (~/examples/throwcatch.js:3:9)</span>
<span class="hljs-comment">//    at repl:1:5</span>
</code></pre>
<p>&#x4E0A;&#x9762;&#x4EE3;&#x7801;&#x4E2D;&#xFF0C;&#x9519;&#x8BEF;&#x5806;&#x6808;&#x7684;&#x6700;&#x5185;&#x5C42;&#x662F;<code>throwit</code>&#x51FD;&#x6570;&#xFF0C;&#x7136;&#x540E;&#x662F;<code>catchit</code>&#x51FD;&#x6570;&#xFF0C;&#x6700;&#x540E;&#x662F;&#x51FD;&#x6570;&#x7684;&#x8FD0;&#x884C;&#x73AF;&#x5883;&#x3002;</p>
<h2 id="&#x539F;&#x751F;&#x9519;&#x8BEF;&#x7C7B;&#x578B;">&#x539F;&#x751F;&#x9519;&#x8BEF;&#x7C7B;&#x578B;</h2>
<p><code>Error</code>&#x5B9E;&#x4F8B;&#x5BF9;&#x8C61;&#x662F;&#x6700;&#x4E00;&#x822C;&#x7684;&#x9519;&#x8BEF;&#x7C7B;&#x578B;&#xFF0C;&#x5728;&#x5B83;&#x7684;&#x57FA;&#x7840;&#x4E0A;&#xFF0C;JavaScript &#x8FD8;&#x5B9A;&#x4E49;&#x4E86;&#x5176;&#x4ED6;6&#x79CD;&#x9519;&#x8BEF;&#x5BF9;&#x8C61;&#x3002;&#x4E5F;&#x5C31;&#x662F;&#x8BF4;&#xFF0C;&#x5B58;&#x5728;<code>Error</code>&#x7684;6&#x4E2A;&#x6D3E;&#x751F;&#x5BF9;&#x8C61;&#x3002;</p>
<h3 id="syntaxerror-&#x5BF9;&#x8C61;">SyntaxError &#x5BF9;&#x8C61;</h3>
<p><code>SyntaxError</code>&#x5BF9;&#x8C61;&#x662F;&#x89E3;&#x6790;&#x4EE3;&#x7801;&#x65F6;&#x53D1;&#x751F;&#x7684;&#x8BED;&#x6CD5;&#x9519;&#x8BEF;&#x3002;</p>
<pre><code class="lang-javascript"><span class="hljs-comment">// &#x53D8;&#x91CF;&#x540D;&#x9519;&#x8BEF;</span>
<span class="hljs-keyword">var</span> <span class="hljs-number">1</span>a;
<span class="hljs-comment">// Uncaught SyntaxError: Invalid or unexpected token</span>

<span class="hljs-comment">// &#x7F3A;&#x5C11;&#x62EC;&#x53F7;</span>
<span class="hljs-built_in">console</span>.log <span class="hljs-string">&apos;hello&apos;</span>);
<span class="hljs-comment">// Uncaught SyntaxError: Unexpected string</span>
</code></pre>
<p>&#x4E0A;&#x9762;&#x4EE3;&#x7801;&#x7684;&#x9519;&#x8BEF;&#xFF0C;&#x90FD;&#x662F;&#x5728;&#x8BED;&#x6CD5;&#x89E3;&#x6790;&#x9636;&#x6BB5;&#x5C31;&#x53EF;&#x4EE5;&#x53D1;&#x73B0;&#xFF0C;&#x6240;&#x4EE5;&#x4F1A;&#x629B;&#x51FA;<code>SyntaxError</code>&#x3002;&#x7B2C;&#x4E00;&#x4E2A;&#x9519;&#x8BEF;&#x63D0;&#x793A;&#x662F;&#x201C;token &#x975E;&#x6CD5;&#x201D;&#xFF0C;&#x7B2C;&#x4E8C;&#x4E2A;&#x9519;&#x8BEF;&#x63D0;&#x793A;&#x662F;&#x201C;&#x5B57;&#x7B26;&#x4E32;&#x4E0D;&#x7B26;&#x5408;&#x8981;&#x6C42;&#x201D;&#x3002;</p>
<h3 id="referenceerror-&#x5BF9;&#x8C61;">ReferenceError &#x5BF9;&#x8C61;</h3>
<p><code>ReferenceError</code>&#x5BF9;&#x8C61;&#x662F;&#x5F15;&#x7528;&#x4E00;&#x4E2A;&#x4E0D;&#x5B58;&#x5728;&#x7684;&#x53D8;&#x91CF;&#x65F6;&#x53D1;&#x751F;&#x7684;&#x9519;&#x8BEF;&#x3002;</p>
<pre><code class="lang-javascript"><span class="hljs-comment">// &#x4F7F;&#x7528;&#x4E00;&#x4E2A;&#x4E0D;&#x5B58;&#x5728;&#x7684;&#x53D8;&#x91CF;</span>
unknownVariable
<span class="hljs-comment">// Uncaught ReferenceError: unknownVariable is not defined</span>
</code></pre>
<p>&#x53E6;&#x4E00;&#x79CD;&#x89E6;&#x53D1;&#x573A;&#x666F;&#x662F;&#xFF0C;&#x5C06;&#x4E00;&#x4E2A;&#x503C;&#x5206;&#x914D;&#x7ED9;&#x65E0;&#x6CD5;&#x5206;&#x914D;&#x7684;&#x5BF9;&#x8C61;&#xFF0C;&#x6BD4;&#x5982;&#x5BF9;&#x51FD;&#x6570;&#x7684;&#x8FD0;&#x884C;&#x7ED3;&#x679C;&#x6216;&#x8005;<code>this</code>&#x8D4B;&#x503C;&#x3002;</p>
<pre><code class="lang-javascript"><span class="hljs-comment">// &#x7B49;&#x53F7;&#x5DE6;&#x4FA7;&#x4E0D;&#x662F;&#x53D8;&#x91CF;</span>
<span class="hljs-built_in">console</span>.log() = <span class="hljs-number">1</span>
<span class="hljs-comment">// Uncaught ReferenceError: Invalid left-hand side in assignment</span>

<span class="hljs-comment">// this &#x5BF9;&#x8C61;&#x4E0D;&#x80FD;&#x624B;&#x52A8;&#x8D4B;&#x503C;</span>
<span class="hljs-keyword">this</span> = <span class="hljs-number">1</span>
<span class="hljs-comment">// ReferenceError: Invalid left-hand side in assignment</span>
</code></pre>
<p>&#x4E0A;&#x9762;&#x4EE3;&#x7801;&#x5BF9;&#x51FD;&#x6570;<code>console.log</code>&#x7684;&#x8FD0;&#x884C;&#x7ED3;&#x679C;&#x548C;<code>this</code>&#x8D4B;&#x503C;&#xFF0C;&#x7ED3;&#x679C;&#x90FD;&#x5F15;&#x53D1;&#x4E86;<code>ReferenceError</code>&#x9519;&#x8BEF;&#x3002;</p>
<h3 id="rangeerror-&#x5BF9;&#x8C61;">RangeError &#x5BF9;&#x8C61;</h3>
<p><code>RangeError</code>&#x5BF9;&#x8C61;&#x662F;&#x4E00;&#x4E2A;&#x503C;&#x8D85;&#x51FA;&#x6709;&#x6548;&#x8303;&#x56F4;&#x65F6;&#x53D1;&#x751F;&#x7684;&#x9519;&#x8BEF;&#x3002;&#x4E3B;&#x8981;&#x6709;&#x51E0;&#x79CD;&#x60C5;&#x51B5;&#xFF0C;&#x4E00;&#x662F;&#x6570;&#x7EC4;&#x957F;&#x5EA6;&#x4E3A;&#x8D1F;&#x6570;&#xFF0C;&#x4E8C;&#x662F;<code>Number</code>&#x5BF9;&#x8C61;&#x7684;&#x65B9;&#x6CD5;&#x53C2;&#x6570;&#x8D85;&#x51FA;&#x8303;&#x56F4;&#xFF0C;&#x4EE5;&#x53CA;&#x51FD;&#x6570;&#x5806;&#x6808;&#x8D85;&#x8FC7;&#x6700;&#x5927;&#x503C;&#x3002;</p>
<pre><code class="lang-javascript"><span class="hljs-comment">// &#x6570;&#x7EC4;&#x957F;&#x5EA6;&#x4E0D;&#x5F97;&#x4E3A;&#x8D1F;&#x6570;</span>
<span class="hljs-keyword">new</span> <span class="hljs-built_in">Array</span>(<span class="hljs-number">-1</span>)
<span class="hljs-comment">// Uncaught RangeError: Invalid array length</span>
</code></pre>
<h3 id="typeerror-&#x5BF9;&#x8C61;">TypeError &#x5BF9;&#x8C61;</h3>
<p><code>TypeError</code>&#x5BF9;&#x8C61;&#x662F;&#x53D8;&#x91CF;&#x6216;&#x53C2;&#x6570;&#x4E0D;&#x662F;&#x9884;&#x671F;&#x7C7B;&#x578B;&#x65F6;&#x53D1;&#x751F;&#x7684;&#x9519;&#x8BEF;&#x3002;&#x6BD4;&#x5982;&#xFF0C;&#x5BF9;&#x5B57;&#x7B26;&#x4E32;&#x3001;&#x5E03;&#x5C14;&#x503C;&#x3001;&#x6570;&#x503C;&#x7B49;&#x539F;&#x59CB;&#x7C7B;&#x578B;&#x7684;&#x503C;&#x4F7F;&#x7528;<code>new</code>&#x547D;&#x4EE4;&#xFF0C;&#x5C31;&#x4F1A;&#x629B;&#x51FA;&#x8FD9;&#x79CD;&#x9519;&#x8BEF;&#xFF0C;&#x56E0;&#x4E3A;<code>new</code>&#x547D;&#x4EE4;&#x7684;&#x53C2;&#x6570;&#x5E94;&#x8BE5;&#x662F;&#x4E00;&#x4E2A;&#x6784;&#x9020;&#x51FD;&#x6570;&#x3002;</p>
<pre><code class="lang-javascript"><span class="hljs-keyword">new</span> <span class="hljs-number">123</span>
<span class="hljs-comment">// Uncaught TypeError: number is not a func</span>

<span class="hljs-keyword">var</span> obj = {};
obj.unknownMethod()
<span class="hljs-comment">// Uncaught TypeError: obj.unknownMethod is not a function</span>
</code></pre>
<p>&#x4E0A;&#x9762;&#x4EE3;&#x7801;&#x7684;&#x7B2C;&#x4E8C;&#x79CD;&#x60C5;&#x51B5;&#xFF0C;&#x8C03;&#x7528;&#x5BF9;&#x8C61;&#x4E0D;&#x5B58;&#x5728;&#x7684;&#x65B9;&#x6CD5;&#xFF0C;&#x4E5F;&#x4F1A;&#x629B;&#x51FA;<code>TypeError</code>&#x9519;&#x8BEF;&#xFF0C;&#x56E0;&#x4E3A;<code>obj.unknownMethod</code>&#x7684;&#x503C;&#x662F;<code>undefined</code>&#xFF0C;&#x800C;&#x4E0D;&#x662F;&#x4E00;&#x4E2A;&#x51FD;&#x6570;&#x3002;</p>
<h3 id="urierror-&#x5BF9;&#x8C61;">URIError &#x5BF9;&#x8C61;</h3>
<p><code>URIError</code>&#x5BF9;&#x8C61;&#x662F; URI &#x76F8;&#x5173;&#x51FD;&#x6570;&#x7684;&#x53C2;&#x6570;&#x4E0D;&#x6B63;&#x786E;&#x65F6;&#x629B;&#x51FA;&#x7684;&#x9519;&#x8BEF;&#xFF0C;&#x4E3B;&#x8981;&#x6D89;&#x53CA;<code>encodeURI()</code>&#x3001;<code>decodeURI()</code>&#x3001;<code>encodeURIComponent()</code>&#x3001;<code>decodeURIComponent()</code>&#x3001;<code>escape()</code>&#x548C;<code>unescape()</code>&#x8FD9;&#x516D;&#x4E2A;&#x51FD;&#x6570;&#x3002;</p>
<pre><code class="lang-javascript"><span class="hljs-built_in">decodeURI</span>(<span class="hljs-string">&apos;%2&apos;</span>)
<span class="hljs-comment">// URIError: URI malformed</span>
</code></pre>
<h3 id="evalerror-&#x5BF9;&#x8C61;">EvalError &#x5BF9;&#x8C61;</h3>
<p><code>eval</code>&#x51FD;&#x6570;&#x6CA1;&#x6709;&#x88AB;&#x6B63;&#x786E;&#x6267;&#x884C;&#x65F6;&#xFF0C;&#x4F1A;&#x629B;&#x51FA;<code>EvalError</code>&#x9519;&#x8BEF;&#x3002;&#x8BE5;&#x9519;&#x8BEF;&#x7C7B;&#x578B;&#x5DF2;&#x7ECF;&#x4E0D;&#x518D;&#x4F7F;&#x7528;&#x4E86;&#xFF0C;&#x53EA;&#x662F;&#x4E3A;&#x4E86;&#x4FDD;&#x8BC1;&#x4E0E;&#x4EE5;&#x524D;&#x4EE3;&#x7801;&#x517C;&#x5BB9;&#xFF0C;&#x624D;&#x7EE7;&#x7EED;&#x4FDD;&#x7559;&#x3002;</p>
<h3 id="&#x603B;&#x7ED3;">&#x603B;&#x7ED3;</h3>
<p>&#x4EE5;&#x4E0A;&#x8FD9;6&#x79CD;&#x6D3E;&#x751F;&#x9519;&#x8BEF;&#xFF0C;&#x8FDE;&#x540C;&#x539F;&#x59CB;&#x7684;<code>Error</code>&#x5BF9;&#x8C61;&#xFF0C;&#x90FD;&#x662F;&#x6784;&#x9020;&#x51FD;&#x6570;&#x3002;&#x5F00;&#x53D1;&#x8005;&#x53EF;&#x4EE5;&#x4F7F;&#x7528;&#x5B83;&#x4EEC;&#xFF0C;&#x624B;&#x52A8;&#x751F;&#x6210;&#x9519;&#x8BEF;&#x5BF9;&#x8C61;&#x7684;&#x5B9E;&#x4F8B;&#x3002;&#x8FD9;&#x4E9B;&#x6784;&#x9020;&#x51FD;&#x6570;&#x90FD;&#x63A5;&#x53D7;&#x4E00;&#x4E2A;&#x53C2;&#x6570;&#xFF0C;&#x4EE3;&#x8868;&#x9519;&#x8BEF;&#x63D0;&#x793A;&#x4FE1;&#x606F;&#xFF08;message&#xFF09;&#x3002;</p>
<pre><code class="lang-javascript"><span class="hljs-keyword">var</span> err1 = <span class="hljs-keyword">new</span> <span class="hljs-built_in">Error</span>(<span class="hljs-string">&apos;&#x51FA;&#x9519;&#x4E86;&#xFF01;&apos;</span>);
<span class="hljs-keyword">var</span> err2 = <span class="hljs-keyword">new</span> <span class="hljs-built_in">RangeError</span>(<span class="hljs-string">&apos;&#x51FA;&#x9519;&#x4E86;&#xFF0C;&#x53D8;&#x91CF;&#x8D85;&#x51FA;&#x6709;&#x6548;&#x8303;&#x56F4;&#xFF01;&apos;</span>);
<span class="hljs-keyword">var</span> err3 = <span class="hljs-keyword">new</span> <span class="hljs-built_in">TypeError</span>(<span class="hljs-string">&apos;&#x51FA;&#x9519;&#x4E86;&#xFF0C;&#x53D8;&#x91CF;&#x7C7B;&#x578B;&#x65E0;&#x6548;&#xFF01;&apos;</span>);

err1.message <span class="hljs-comment">// &quot;&#x51FA;&#x9519;&#x4E86;&#xFF01;&quot;</span>
err2.message <span class="hljs-comment">// &quot;&#x51FA;&#x9519;&#x4E86;&#xFF0C;&#x53D8;&#x91CF;&#x8D85;&#x51FA;&#x6709;&#x6548;&#x8303;&#x56F4;&#xFF01;&quot;</span>
err3.message <span class="hljs-comment">// &quot;&#x51FA;&#x9519;&#x4E86;&#xFF0C;&#x53D8;&#x91CF;&#x7C7B;&#x578B;&#x65E0;&#x6548;&#xFF01;&quot;</span>
</code></pre>
<h2 id="&#x81EA;&#x5B9A;&#x4E49;&#x9519;&#x8BEF;">&#x81EA;&#x5B9A;&#x4E49;&#x9519;&#x8BEF;</h2>
<p>&#x9664;&#x4E86; JavaScript &#x539F;&#x751F;&#x63D0;&#x4F9B;&#x7684;&#x4E03;&#x79CD;&#x9519;&#x8BEF;&#x5BF9;&#x8C61;&#xFF0C;&#x8FD8;&#x53EF;&#x4EE5;&#x5B9A;&#x4E49;&#x81EA;&#x5DF1;&#x7684;&#x9519;&#x8BEF;&#x5BF9;&#x8C61;&#x3002;</p>
<pre><code class="lang-javascript"><span class="hljs-function"><span class="hljs-keyword">function</span> <span class="hljs-title">UserError</span>(<span class="hljs-params">message</span>) </span>{
  <span class="hljs-keyword">this</span>.message = message || <span class="hljs-string">&apos;&#x9ED8;&#x8BA4;&#x4FE1;&#x606F;&apos;</span>;
  <span class="hljs-keyword">this</span>.name = <span class="hljs-string">&apos;UserError&apos;</span>;
}

UserError.prototype = <span class="hljs-keyword">new</span> <span class="hljs-built_in">Error</span>();
UserError.prototype.constructor = UserError;
</code></pre>
<p>&#x4E0A;&#x9762;&#x4EE3;&#x7801;&#x81EA;&#x5B9A;&#x4E49;&#x4E00;&#x4E2A;&#x9519;&#x8BEF;&#x5BF9;&#x8C61;<code>UserError</code>&#xFF0C;&#x8BA9;&#x5B83;&#x7EE7;&#x627F;<code>Error</code>&#x5BF9;&#x8C61;&#x3002;&#x7136;&#x540E;&#xFF0C;&#x5C31;&#x53EF;&#x4EE5;&#x751F;&#x6210;&#x8FD9;&#x79CD;&#x81EA;&#x5B9A;&#x4E49;&#x7C7B;&#x578B;&#x7684;&#x9519;&#x8BEF;&#x4E86;&#x3002;</p>
<pre><code class="lang-javascript"><span class="hljs-keyword">new</span> UserError(<span class="hljs-string">&apos;&#x8FD9;&#x662F;&#x81EA;&#x5B9A;&#x4E49;&#x7684;&#x9519;&#x8BEF;&#xFF01;&apos;</span>);
</code></pre>
<h2 id="throw-&#x8BED;&#x53E5;">throw &#x8BED;&#x53E5;</h2>
<p><code>throw</code>&#x8BED;&#x53E5;&#x7684;&#x4F5C;&#x7528;&#x662F;&#x624B;&#x52A8;&#x4E2D;&#x65AD;&#x7A0B;&#x5E8F;&#x6267;&#x884C;&#xFF0C;&#x629B;&#x51FA;&#x4E00;&#x4E2A;&#x9519;&#x8BEF;&#x3002;</p>
<pre><code class="lang-javascript"><span class="hljs-keyword">if</span> (x &lt;= <span class="hljs-number">0</span>) {
  <span class="hljs-keyword">throw</span> <span class="hljs-keyword">new</span> <span class="hljs-built_in">Error</span>(<span class="hljs-string">&apos;x &#x5FC5;&#x987B;&#x4E3A;&#x6B63;&#x6570;&apos;</span>);
}
<span class="hljs-comment">// Uncaught ReferenceError: x is not defined</span>
</code></pre>
<p>&#x4E0A;&#x9762;&#x4EE3;&#x7801;&#x4E2D;&#xFF0C;&#x5982;&#x679C;&#x53D8;&#x91CF;<code>x</code>&#x5C0F;&#x4E8E;&#x7B49;&#x4E8E;<code>0</code>&#xFF0C;&#x5C31;&#x624B;&#x52A8;&#x629B;&#x51FA;&#x4E00;&#x4E2A;&#x9519;&#x8BEF;&#xFF0C;&#x544A;&#x8BC9;&#x7528;&#x6237;<code>x</code>&#x7684;&#x503C;&#x4E0D;&#x6B63;&#x786E;&#xFF0C;&#x6574;&#x4E2A;&#x7A0B;&#x5E8F;&#x5C31;&#x4F1A;&#x5728;&#x8FD9;&#x91CC;&#x4E2D;&#x65AD;&#x6267;&#x884C;&#x3002;&#x53EF;&#x4EE5;&#x770B;&#x5230;&#xFF0C;<code>throw</code>&#x629B;&#x51FA;&#x7684;&#x9519;&#x8BEF;&#x5C31;&#x662F;&#x5B83;&#x7684;&#x53C2;&#x6570;&#xFF0C;&#x8FD9;&#x91CC;&#x662F;&#x4E00;&#x4E2A;<code>Error</code>&#x5B9E;&#x4F8B;&#x3002;</p>
<p><code>throw</code>&#x4E5F;&#x53EF;&#x4EE5;&#x629B;&#x51FA;&#x81EA;&#x5B9A;&#x4E49;&#x9519;&#x8BEF;&#x3002;</p>
<pre><code class="lang-javascript"><span class="hljs-function"><span class="hljs-keyword">function</span> <span class="hljs-title">UserError</span>(<span class="hljs-params">message</span>) </span>{
  <span class="hljs-keyword">this</span>.message = message || <span class="hljs-string">&apos;&#x9ED8;&#x8BA4;&#x4FE1;&#x606F;&apos;</span>;
  <span class="hljs-keyword">this</span>.name = <span class="hljs-string">&apos;UserError&apos;</span>;
}

<span class="hljs-keyword">throw</span> <span class="hljs-keyword">new</span> UserError(<span class="hljs-string">&apos;&#x51FA;&#x9519;&#x4E86;&#xFF01;&apos;</span>);
<span class="hljs-comment">// Uncaught UserError {message: &quot;&#x51FA;&#x9519;&#x4E86;&#xFF01;&quot;, name: &quot;UserError&quot;}</span>
</code></pre>
<p>&#x4E0A;&#x9762;&#x4EE3;&#x7801;&#x4E2D;&#xFF0C;<code>throw</code>&#x629B;&#x51FA;&#x7684;&#x662F;&#x4E00;&#x4E2A;<code>UserError</code>&#x5B9E;&#x4F8B;&#x3002;</p>
<p>&#x5B9E;&#x9645;&#x4E0A;&#xFF0C;<code>throw</code>&#x53EF;&#x4EE5;&#x629B;&#x51FA;&#x4EFB;&#x4F55;&#x7C7B;&#x578B;&#x7684;&#x503C;&#x3002;&#x4E5F;&#x5C31;&#x662F;&#x8BF4;&#xFF0C;&#x5B83;&#x7684;&#x53C2;&#x6570;&#x53EF;&#x4EE5;&#x662F;&#x4EFB;&#x4F55;&#x503C;&#x3002;</p>
<pre><code class="lang-javascript"><span class="hljs-comment">// &#x629B;&#x51FA;&#x4E00;&#x4E2A;&#x5B57;&#x7B26;&#x4E32;</span>
<span class="hljs-keyword">throw</span> <span class="hljs-string">&apos;Error&#xFF01;&apos;</span>;
<span class="hljs-comment">// Uncaught Error&#xFF01;</span>

<span class="hljs-comment">// &#x629B;&#x51FA;&#x4E00;&#x4E2A;&#x6570;&#x503C;</span>
<span class="hljs-keyword">throw</span> <span class="hljs-number">42</span>;
<span class="hljs-comment">// Uncaught 42</span>

<span class="hljs-comment">// &#x629B;&#x51FA;&#x4E00;&#x4E2A;&#x5E03;&#x5C14;&#x503C;</span>
<span class="hljs-keyword">throw</span> <span class="hljs-literal">true</span>;
<span class="hljs-comment">// Uncaught true</span>

<span class="hljs-comment">// &#x629B;&#x51FA;&#x4E00;&#x4E2A;&#x5BF9;&#x8C61;</span>
<span class="hljs-keyword">throw</span> {
  toString: <span class="hljs-function"><span class="hljs-keyword">function</span> (<span class="hljs-params"></span>) </span>{
    <span class="hljs-keyword">return</span> <span class="hljs-string">&apos;Error!&apos;</span>;
  }
};
<span class="hljs-comment">// Uncaught {toString: &#x192;}</span>
</code></pre>
<p>&#x5BF9;&#x4E8E; JavaScript &#x5F15;&#x64CE;&#x6765;&#x8BF4;&#xFF0C;&#x9047;&#x5230;<code>throw</code>&#x8BED;&#x53E5;&#xFF0C;&#x7A0B;&#x5E8F;&#x5C31;&#x4E2D;&#x6B62;&#x4E86;&#x3002;&#x5F15;&#x64CE;&#x4F1A;&#x63A5;&#x6536;&#x5230;<code>throw</code>&#x629B;&#x51FA;&#x7684;&#x4FE1;&#x606F;&#xFF0C;&#x53EF;&#x80FD;&#x662F;&#x4E00;&#x4E2A;&#x9519;&#x8BEF;&#x5B9E;&#x4F8B;&#xFF0C;&#x4E5F;&#x53EF;&#x80FD;&#x662F;&#x5176;&#x4ED6;&#x7C7B;&#x578B;&#x7684;&#x503C;&#x3002;</p>
<h2 id="trycatch-&#x7ED3;&#x6784;">try...catch &#x7ED3;&#x6784;</h2>
<p>&#x4E00;&#x65E6;&#x53D1;&#x751F;&#x9519;&#x8BEF;&#xFF0C;&#x7A0B;&#x5E8F;&#x5C31;&#x4E2D;&#x6B62;&#x6267;&#x884C;&#x4E86;&#x3002;JavaScript &#x63D0;&#x4F9B;&#x4E86;<code>try...catch</code>&#x7ED3;&#x6784;&#xFF0C;&#x5141;&#x8BB8;&#x5BF9;&#x9519;&#x8BEF;&#x8FDB;&#x884C;&#x5904;&#x7406;&#xFF0C;&#x9009;&#x62E9;&#x662F;&#x5426;&#x5F80;&#x4E0B;&#x6267;&#x884C;&#x3002;</p>
<pre><code class="lang-javascript"><span class="hljs-keyword">try</span> {
  <span class="hljs-keyword">throw</span> <span class="hljs-keyword">new</span> <span class="hljs-built_in">Error</span>(<span class="hljs-string">&apos;&#x51FA;&#x9519;&#x4E86;!&apos;</span>);
} <span class="hljs-keyword">catch</span> (e) {
  <span class="hljs-built_in">console</span>.log(e.name + <span class="hljs-string">&quot;: &quot;</span> + e.message);
  <span class="hljs-built_in">console</span>.log(e.stack);
}
<span class="hljs-comment">// Error: &#x51FA;&#x9519;&#x4E86;!</span>
<span class="hljs-comment">//   at &lt;anonymous&gt;:3:9</span>
<span class="hljs-comment">//   ...</span>
</code></pre>
<p>&#x4E0A;&#x9762;&#x4EE3;&#x7801;&#x4E2D;&#xFF0C;<code>try</code>&#x4EE3;&#x7801;&#x5757;&#x629B;&#x51FA;&#x9519;&#x8BEF;&#xFF08;&#x4E0A;&#x4F8B;&#x7528;&#x7684;&#x662F;<code>throw</code>&#x8BED;&#x53E5;&#xFF09;&#xFF0C;JavaScript &#x5F15;&#x64CE;&#x5C31;&#x7ACB;&#x5373;&#x628A;&#x4EE3;&#x7801;&#x7684;&#x6267;&#x884C;&#xFF0C;&#x8F6C;&#x5230;<code>catch</code>&#x4EE3;&#x7801;&#x5757;&#xFF0C;&#x6216;&#x8005;&#x8BF4;&#x9519;&#x8BEF;&#x88AB;<code>catch</code>&#x4EE3;&#x7801;&#x5757;&#x6355;&#x83B7;&#x4E86;&#x3002;<code>catch</code>&#x63A5;&#x53D7;&#x4E00;&#x4E2A;&#x53C2;&#x6570;&#xFF0C;&#x8868;&#x793A;<code>try</code>&#x4EE3;&#x7801;&#x5757;&#x629B;&#x51FA;&#x7684;&#x503C;&#x3002;</p>
<p>&#x5982;&#x679C;&#x4F60;&#x4E0D;&#x786E;&#x5B9A;&#x67D0;&#x4E9B;&#x4EE3;&#x7801;&#x662F;&#x5426;&#x4F1A;&#x62A5;&#x9519;&#xFF0C;&#x5C31;&#x53EF;&#x4EE5;&#x628A;&#x5B83;&#x4EEC;&#x653E;&#x5728;<code>try...catch</code>&#x4EE3;&#x7801;&#x5757;&#x4E4B;&#x4E2D;&#xFF0C;&#x4FBF;&#x4E8E;&#x8FDB;&#x4E00;&#x6B65;&#x5BF9;&#x9519;&#x8BEF;&#x8FDB;&#x884C;&#x5904;&#x7406;&#x3002;</p>
<pre><code class="lang-javascript"><span class="hljs-keyword">try</span> {
  f();
} <span class="hljs-keyword">catch</span>(e) {
  <span class="hljs-comment">// &#x5904;&#x7406;&#x9519;&#x8BEF;</span>
}
</code></pre>
<p>&#x4E0A;&#x9762;&#x4EE3;&#x7801;&#x4E2D;&#xFF0C;&#x5982;&#x679C;&#x51FD;&#x6570;<code>f</code>&#x6267;&#x884C;&#x62A5;&#x9519;&#xFF0C;&#x5C31;&#x4F1A;&#x8FDB;&#x884C;<code>catch</code>&#x4EE3;&#x7801;&#x5757;&#xFF0C;&#x63A5;&#x7740;&#x5BF9;&#x9519;&#x8BEF;&#x8FDB;&#x884C;&#x5904;&#x7406;&#x3002;</p>
<p><code>catch</code>&#x4EE3;&#x7801;&#x5757;&#x6355;&#x83B7;&#x9519;&#x8BEF;&#x4E4B;&#x540E;&#xFF0C;&#x7A0B;&#x5E8F;&#x4E0D;&#x4F1A;&#x4E2D;&#x65AD;&#xFF0C;&#x4F1A;&#x6309;&#x7167;&#x6B63;&#x5E38;&#x6D41;&#x7A0B;&#x7EE7;&#x7EED;&#x6267;&#x884C;&#x4E0B;&#x53BB;&#x3002;</p>
<pre><code class="lang-javascript"><span class="hljs-keyword">try</span> {
  <span class="hljs-keyword">throw</span> <span class="hljs-string">&quot;&#x51FA;&#x9519;&#x4E86;&quot;</span>;
} <span class="hljs-keyword">catch</span> (e) {
  <span class="hljs-built_in">console</span>.log(<span class="hljs-number">111</span>);
}
<span class="hljs-built_in">console</span>.log(<span class="hljs-number">222</span>);
<span class="hljs-comment">// 111</span>
<span class="hljs-comment">// 222</span>
</code></pre>
<p>&#x4E0A;&#x9762;&#x4EE3;&#x7801;&#x4E2D;&#xFF0C;<code>try</code>&#x4EE3;&#x7801;&#x5757;&#x629B;&#x51FA;&#x7684;&#x9519;&#x8BEF;&#xFF0C;&#x88AB;<code>catch</code>&#x4EE3;&#x7801;&#x5757;&#x6355;&#x83B7;&#x540E;&#xFF0C;&#x7A0B;&#x5E8F;&#x4F1A;&#x7EE7;&#x7EED;&#x5411;&#x4E0B;&#x6267;&#x884C;&#x3002;</p>
<p><code>catch</code>&#x4EE3;&#x7801;&#x5757;&#x4E4B;&#x4E2D;&#xFF0C;&#x8FD8;&#x53EF;&#x4EE5;&#x518D;&#x629B;&#x51FA;&#x9519;&#x8BEF;&#xFF0C;&#x751A;&#x81F3;&#x4F7F;&#x7528;&#x5D4C;&#x5957;&#x7684;<code>try...catch</code>&#x7ED3;&#x6784;&#x3002;</p>
<pre><code class="lang-javascript"><span class="hljs-keyword">var</span> n = <span class="hljs-number">100</span>;

<span class="hljs-keyword">try</span> {
  <span class="hljs-keyword">throw</span> n;
} <span class="hljs-keyword">catch</span> (e) {
  <span class="hljs-keyword">if</span> (e &lt;= <span class="hljs-number">50</span>) {
    <span class="hljs-comment">// ...</span>
  } <span class="hljs-keyword">else</span> {
    <span class="hljs-keyword">throw</span> e;
  }
}
<span class="hljs-comment">// Uncaught 100</span>
</code></pre>
<p>&#x4E0A;&#x9762;&#x4EE3;&#x7801;&#x4E2D;&#xFF0C;<code>catch</code>&#x4EE3;&#x7801;&#x4E4B;&#x4E2D;&#x53C8;&#x629B;&#x51FA;&#x4E86;&#x4E00;&#x4E2A;&#x9519;&#x8BEF;&#x3002;</p>
<p>&#x4E3A;&#x4E86;&#x6355;&#x6349;&#x4E0D;&#x540C;&#x7C7B;&#x578B;&#x7684;&#x9519;&#x8BEF;&#xFF0C;<code>catch</code>&#x4EE3;&#x7801;&#x5757;&#x4E4B;&#x4E2D;&#x53EF;&#x4EE5;&#x52A0;&#x5165;&#x5224;&#x65AD;&#x8BED;&#x53E5;&#x3002;</p>
<pre><code class="lang-javascript"><span class="hljs-keyword">try</span> {
  foo.bar();
} <span class="hljs-keyword">catch</span> (e) {
  <span class="hljs-keyword">if</span> (e <span class="hljs-keyword">instanceof</span> <span class="hljs-built_in">EvalError</span>) {
    <span class="hljs-built_in">console</span>.log(e.name + <span class="hljs-string">&quot;: &quot;</span> + e.message);
  } <span class="hljs-keyword">else</span> <span class="hljs-keyword">if</span> (e <span class="hljs-keyword">instanceof</span> <span class="hljs-built_in">RangeError</span>) {
    <span class="hljs-built_in">console</span>.log(e.name + <span class="hljs-string">&quot;: &quot;</span> + e.message);
  }
  <span class="hljs-comment">// ...</span>
}
</code></pre>
<p>&#x4E0A;&#x9762;&#x4EE3;&#x7801;&#x4E2D;&#xFF0C;<code>catch</code>&#x6355;&#x83B7;&#x9519;&#x8BEF;&#x4E4B;&#x540E;&#xFF0C;&#x4F1A;&#x5224;&#x65AD;&#x9519;&#x8BEF;&#x7C7B;&#x578B;&#xFF08;<code>EvalError</code>&#x8FD8;&#x662F;<code>RangeError</code>&#xFF09;&#xFF0C;&#x8FDB;&#x884C;&#x4E0D;&#x540C;&#x7684;&#x5904;&#x7406;&#x3002;</p>
<h2 id="finally-&#x4EE3;&#x7801;&#x5757;">finally &#x4EE3;&#x7801;&#x5757;</h2>
<p><code>try...catch</code>&#x7ED3;&#x6784;&#x5141;&#x8BB8;&#x5728;&#x6700;&#x540E;&#x6DFB;&#x52A0;&#x4E00;&#x4E2A;<code>finally</code>&#x4EE3;&#x7801;&#x5757;&#xFF0C;&#x8868;&#x793A;&#x4E0D;&#x7BA1;&#x662F;&#x5426;&#x51FA;&#x73B0;&#x9519;&#x8BEF;&#xFF0C;&#x90FD;&#x5FC5;&#x9700;&#x5728;&#x6700;&#x540E;&#x8FD0;&#x884C;&#x7684;&#x8BED;&#x53E5;&#x3002;</p>
<pre><code class="lang-javascript"><span class="hljs-function"><span class="hljs-keyword">function</span> <span class="hljs-title">cleansUp</span>(<span class="hljs-params"></span>) </span>{
  <span class="hljs-keyword">try</span> {
    <span class="hljs-keyword">throw</span> <span class="hljs-keyword">new</span> <span class="hljs-built_in">Error</span>(<span class="hljs-string">&apos;&#x51FA;&#x9519;&#x4E86;&#x2026;&#x2026;&apos;</span>);
    <span class="hljs-built_in">console</span>.log(<span class="hljs-string">&apos;&#x6B64;&#x884C;&#x4E0D;&#x4F1A;&#x6267;&#x884C;&apos;</span>);
  } <span class="hljs-keyword">finally</span> {
    <span class="hljs-built_in">console</span>.log(<span class="hljs-string">&apos;&#x5B8C;&#x6210;&#x6E05;&#x7406;&#x5DE5;&#x4F5C;&apos;</span>);
  }
}

cleansUp()
<span class="hljs-comment">// &#x5B8C;&#x6210;&#x6E05;&#x7406;&#x5DE5;&#x4F5C;</span>
<span class="hljs-comment">// Uncaught Error: &#x51FA;&#x9519;&#x4E86;&#x2026;&#x2026;</span>
<span class="hljs-comment">//    at cleansUp (&lt;anonymous&gt;:3:11)</span>
<span class="hljs-comment">//    at &lt;anonymous&gt;:10:1</span>
</code></pre>
<p>&#x4E0A;&#x9762;&#x4EE3;&#x7801;&#x4E2D;&#xFF0C;&#x7531;&#x4E8E;&#x6CA1;&#x6709;<code>catch</code>&#x8BED;&#x53E5;&#x5757;&#xFF0C;&#x4E00;&#x65E6;&#x53D1;&#x751F;&#x9519;&#x8BEF;&#xFF0C;&#x4EE3;&#x7801;&#x5C31;&#x4F1A;&#x4E2D;&#x65AD;&#x6267;&#x884C;&#x3002;&#x4E2D;&#x65AD;&#x6267;&#x884C;&#x4E4B;&#x524D;&#xFF0C;&#x4F1A;&#x5148;&#x6267;&#x884C;<code>finally</code>&#x4EE3;&#x7801;&#x5757;&#xFF0C;&#x7136;&#x540E;&#x518D;&#x5411;&#x7528;&#x6237;&#x63D0;&#x793A;&#x62A5;&#x9519;&#x4FE1;&#x606F;&#x3002;</p>
<pre><code class="lang-javascript"><span class="hljs-function"><span class="hljs-keyword">function</span> <span class="hljs-title">idle</span>(<span class="hljs-params">x</span>) </span>{
  <span class="hljs-keyword">try</span> {
    <span class="hljs-built_in">console</span>.log(x);
    <span class="hljs-keyword">return</span> <span class="hljs-string">&apos;result&apos;</span>;
  } <span class="hljs-keyword">finally</span> {
    <span class="hljs-built_in">console</span>.log(<span class="hljs-string">&apos;FINALLY&apos;</span>);
  }
}

idle(<span class="hljs-string">&apos;hello&apos;</span>)
<span class="hljs-comment">// hello</span>
<span class="hljs-comment">// FINALLY</span>
</code></pre>
<p>&#x4E0A;&#x9762;&#x4EE3;&#x7801;&#x4E2D;&#xFF0C;<code>try</code>&#x4EE3;&#x7801;&#x5757;&#x6CA1;&#x6709;&#x53D1;&#x751F;&#x9519;&#x8BEF;&#xFF0C;&#x800C;&#x4E14;&#x91CC;&#x9762;&#x8FD8;&#x5305;&#x62EC;<code>return</code>&#x8BED;&#x53E5;&#xFF0C;&#x4F46;&#x662F;<code>finally</code>&#x4EE3;&#x7801;&#x5757;&#x4F9D;&#x7136;&#x4F1A;&#x6267;&#x884C;&#x3002;&#x800C;&#x4E14;&#xFF0C;&#x8FD9;&#x4E2A;&#x51FD;&#x6570;&#x7684;&#x8FD4;&#x56DE;&#x503C;&#x8FD8;&#x662F;<code>result</code>&#x3002;</p>
<p>&#x4E0B;&#x9762;&#x7684;&#x4F8B;&#x5B50;&#x8BF4;&#x660E;&#xFF0C;<code>return</code>&#x8BED;&#x53E5;&#x7684;&#x6267;&#x884C;&#x662F;&#x6392;&#x5728;<code>finally</code>&#x4EE3;&#x7801;&#x4E4B;&#x524D;&#xFF0C;&#x53EA;&#x662F;&#x7B49;<code>finally</code>&#x4EE3;&#x7801;&#x6267;&#x884C;&#x5B8C;&#x6BD5;&#x540E;&#x624D;&#x8FD4;&#x56DE;&#x3002;</p>
<pre><code class="lang-javascript"><span class="hljs-keyword">var</span> count = <span class="hljs-number">0</span>;
<span class="hljs-function"><span class="hljs-keyword">function</span> <span class="hljs-title">countUp</span>(<span class="hljs-params"></span>) </span>{
  <span class="hljs-keyword">try</span> {
    <span class="hljs-keyword">return</span> count;
  } <span class="hljs-keyword">finally</span> {
    count++;
  }
}

countUp()
<span class="hljs-comment">// 0</span>
count
<span class="hljs-comment">// 1</span>
</code></pre>
<p>&#x4E0A;&#x9762;&#x4EE3;&#x7801;&#x8BF4;&#x660E;&#xFF0C;<code>return</code>&#x8BED;&#x53E5;&#x91CC;&#x9762;&#x7684;<code>count</code>&#x7684;&#x503C;&#xFF0C;&#x662F;&#x5728;<code>finally</code>&#x4EE3;&#x7801;&#x5757;&#x8FD0;&#x884C;&#x4E4B;&#x524D;&#x5C31;&#x83B7;&#x53D6;&#x4E86;&#x3002;</p>
<p>&#x4E0B;&#x9762;&#x662F;<code>finally</code>&#x4EE3;&#x7801;&#x5757;&#x7528;&#x6CD5;&#x7684;&#x5178;&#x578B;&#x573A;&#x666F;&#x3002;</p>
<pre><code class="lang-javascript">openFile();

<span class="hljs-keyword">try</span> {
  writeFile(Data);
} <span class="hljs-keyword">catch</span>(e) {
  handleError(e);
} <span class="hljs-keyword">finally</span> {
  closeFile();
}
</code></pre>
<p>&#x4E0A;&#x9762;&#x4EE3;&#x7801;&#x9996;&#x5148;&#x6253;&#x5F00;&#x4E00;&#x4E2A;&#x6587;&#x4EF6;&#xFF0C;&#x7136;&#x540E;&#x5728;<code>try</code>&#x4EE3;&#x7801;&#x5757;&#x4E2D;&#x5199;&#x5165;&#x6587;&#x4EF6;&#xFF0C;&#x5982;&#x679C;&#x6CA1;&#x6709;&#x53D1;&#x751F;&#x9519;&#x8BEF;&#xFF0C;&#x5219;&#x8FD0;&#x884C;<code>finally</code>&#x4EE3;&#x7801;&#x5757;&#x5173;&#x95ED;&#x6587;&#x4EF6;&#xFF1B;&#x4E00;&#x65E6;&#x53D1;&#x751F;&#x9519;&#x8BEF;&#xFF0C;&#x5219;&#x5148;&#x4F7F;&#x7528;<code>catch</code>&#x4EE3;&#x7801;&#x5757;&#x5904;&#x7406;&#x9519;&#x8BEF;&#xFF0C;&#x518D;&#x4F7F;&#x7528;<code>finally</code>&#x4EE3;&#x7801;&#x5757;&#x5173;&#x95ED;&#x6587;&#x4EF6;&#x3002;</p>
<p>&#x4E0B;&#x9762;&#x7684;&#x4F8B;&#x5B50;&#x5145;&#x5206;&#x53CD;&#x6620;&#x4E86;<code>try...catch...finally</code>&#x8FD9;&#x4E09;&#x8005;&#x4E4B;&#x95F4;&#x7684;&#x6267;&#x884C;&#x987A;&#x5E8F;&#x3002;</p>
<pre><code class="lang-javascript"><span class="hljs-function"><span class="hljs-keyword">function</span> <span class="hljs-title">f</span>(<span class="hljs-params"></span>) </span>{
  <span class="hljs-keyword">try</span> {
    <span class="hljs-built_in">console</span>.log(<span class="hljs-number">0</span>);
    <span class="hljs-keyword">throw</span> <span class="hljs-string">&apos;bug&apos;</span>;
  } <span class="hljs-keyword">catch</span>(e) {
    <span class="hljs-built_in">console</span>.log(<span class="hljs-number">1</span>);
    <span class="hljs-keyword">return</span> <span class="hljs-literal">true</span>; <span class="hljs-comment">// &#x8FD9;&#x53E5;&#x539F;&#x672C;&#x4F1A;&#x5EF6;&#x8FDF;&#x5230; finally &#x4EE3;&#x7801;&#x5757;&#x7ED3;&#x675F;&#x518D;&#x6267;&#x884C;</span>
    <span class="hljs-built_in">console</span>.log(<span class="hljs-number">2</span>); <span class="hljs-comment">// &#x4E0D;&#x4F1A;&#x8FD0;&#x884C;</span>
  } <span class="hljs-keyword">finally</span> {
    <span class="hljs-built_in">console</span>.log(<span class="hljs-number">3</span>);
    <span class="hljs-keyword">return</span> <span class="hljs-literal">false</span>; <span class="hljs-comment">// &#x8FD9;&#x53E5;&#x4F1A;&#x8986;&#x76D6;&#x6389;&#x524D;&#x9762;&#x90A3;&#x53E5; return</span>
    <span class="hljs-built_in">console</span>.log(<span class="hljs-number">4</span>); <span class="hljs-comment">// &#x4E0D;&#x4F1A;&#x8FD0;&#x884C;</span>
  }

  <span class="hljs-built_in">console</span>.log(<span class="hljs-number">5</span>); <span class="hljs-comment">// &#x4E0D;&#x4F1A;&#x8FD0;&#x884C;</span>
}

<span class="hljs-keyword">var</span> result = f();
<span class="hljs-comment">// 0</span>
<span class="hljs-comment">// 1</span>
<span class="hljs-comment">// 3</span>

result
<span class="hljs-comment">// false</span>
</code></pre>
<p>&#x4E0A;&#x9762;&#x4EE3;&#x7801;&#x4E2D;&#xFF0C;<code>catch</code>&#x4EE3;&#x7801;&#x5757;&#x7ED3;&#x675F;&#x6267;&#x884C;&#x4E4B;&#x524D;&#xFF0C;&#x4F1A;&#x5148;&#x6267;&#x884C;<code>finally</code>&#x4EE3;&#x7801;&#x5757;&#x3002;</p>
<p><code>catch</code>&#x4EE3;&#x7801;&#x5757;&#x4E4B;&#x4E2D;&#xFF0C;&#x89E6;&#x53D1;&#x8F6C;&#x5165;<code>finally</code>&#x4EE3;&#x7801;&#x5FEB;&#x7684;&#x6807;&#x5FD7;&#xFF0C;&#x4E0D;&#x4EC5;&#x6709;<code>return</code>&#x8BED;&#x53E5;&#xFF0C;&#x8FD8;&#x6709;<code>throw</code>&#x8BED;&#x53E5;&#x3002;</p>
<pre><code class="lang-javascript"><span class="hljs-function"><span class="hljs-keyword">function</span> <span class="hljs-title">f</span>(<span class="hljs-params"></span>) </span>{
  <span class="hljs-keyword">try</span> {
    <span class="hljs-keyword">throw</span> <span class="hljs-string">&apos;&#x51FA;&#x9519;&#x4E86;&#xFF01;&apos;</span>;
  } <span class="hljs-keyword">catch</span>(e) {
    <span class="hljs-built_in">console</span>.log(<span class="hljs-string">&apos;&#x6355;&#x6349;&#x5230;&#x5185;&#x90E8;&#x9519;&#x8BEF;&apos;</span>);
    <span class="hljs-keyword">throw</span> e; <span class="hljs-comment">// &#x8FD9;&#x53E5;&#x539F;&#x672C;&#x4F1A;&#x7B49;&#x5230;finally&#x7ED3;&#x675F;&#x518D;&#x6267;&#x884C;</span>
  } <span class="hljs-keyword">finally</span> {
    <span class="hljs-keyword">return</span> <span class="hljs-literal">false</span>; <span class="hljs-comment">// &#x76F4;&#x63A5;&#x8FD4;&#x56DE;</span>
  }
}

<span class="hljs-keyword">try</span> {
  f();
} <span class="hljs-keyword">catch</span>(e) {
  <span class="hljs-comment">// &#x6B64;&#x5904;&#x4E0D;&#x4F1A;&#x6267;&#x884C;</span>
  <span class="hljs-built_in">console</span>.log(<span class="hljs-string">&apos;caught outer &quot;bogus&quot;&apos;</span>);
}

<span class="hljs-comment">//  &#x6355;&#x6349;&#x5230;&#x5185;&#x90E8;&#x9519;&#x8BEF;</span>
</code></pre>
<p>&#x4E0A;&#x9762;&#x4EE3;&#x7801;&#x4E2D;&#xFF0C;&#x8FDB;&#x5165;<code>catch</code>&#x4EE3;&#x7801;&#x5757;&#x4E4B;&#x540E;&#xFF0C;&#x4E00;&#x9047;&#x5230;<code>throw</code>&#x8BED;&#x53E5;&#xFF0C;&#x5C31;&#x4F1A;&#x53BB;&#x6267;&#x884C;<code>finally</code>&#x4EE3;&#x7801;&#x5757;&#xFF0C;&#x5176;&#x4E2D;&#x6709;<code>return false</code>&#x8BED;&#x53E5;&#xFF0C;&#x56E0;&#x6B64;&#x5C31;&#x76F4;&#x63A5;&#x8FD4;&#x56DE;&#x4E86;&#xFF0C;&#x4E0D;&#x518D;&#x4F1A;&#x56DE;&#x53BB;&#x6267;&#x884C;<code>catch</code>&#x4EE3;&#x7801;&#x5757;&#x5269;&#x4E0B;&#x7684;&#x90E8;&#x5206;&#x4E86;&#x3002;</p>
<p><code>try</code>&#x4EE3;&#x7801;&#x5757;&#x5185;&#x90E8;&#xFF0C;&#x8FD8;&#x53EF;&#x4EE5;&#x518D;&#x4F7F;&#x7528;<code>try</code>&#x4EE3;&#x7801;&#x5757;&#x3002;</p>
<pre><code class="lang-javascript"><span class="hljs-keyword">try</span> {
  <span class="hljs-keyword">try</span> {
    consle.log(<span class="hljs-string">&apos;Hello world!&apos;</span>); <span class="hljs-comment">// &#x62A5;&#x9519;</span>
  }
  <span class="hljs-keyword">finally</span> {
    <span class="hljs-built_in">console</span>.log(<span class="hljs-string">&apos;Finally&apos;</span>);
  }
  <span class="hljs-built_in">console</span>.log(<span class="hljs-string">&apos;Will I run?&apos;</span>);
} <span class="hljs-keyword">catch</span>(error) {
  <span class="hljs-built_in">console</span>.error(error.message);
}
<span class="hljs-comment">// Finally</span>
<span class="hljs-comment">// consle is not defined</span>
</code></pre>
<p>&#x4E0A;&#x9762;&#x4EE3;&#x7801;&#x4E2D;&#xFF0C;<code>try</code>&#x91CC;&#x9762;&#x8FD8;&#x6709;&#x4E00;&#x4E2A;<code>try</code>&#x3002;&#x5185;&#x5C42;&#x7684;<code>try</code>&#x62A5;&#x9519;&#xFF08;<code>console</code>&#x62FC;&#x9519;&#x4E86;&#xFF09;&#xFF0C;&#x8FD9;&#x65F6;&#x4F1A;&#x6267;&#x884C;&#x5185;&#x5C42;&#x7684;<code>finally</code>&#x4EE3;&#x7801;&#x5757;&#xFF0C;&#x7136;&#x540E;&#x629B;&#x51FA;&#x9519;&#x8BEF;&#xFF0C;&#x88AB;&#x5916;&#x5C42;&#x7684;<code>catch</code>&#x6355;&#x83B7;&#x3002;</p>
<h2 id="&#x53C2;&#x8003;&#x8FDE;&#x63A5;">&#x53C2;&#x8003;&#x8FDE;&#x63A5;</h2>
<ul>
<li>Jani Hartikainen, <a href="http://davidwalsh.name/fix-javascript-errors" target="_blank" rel="nofollow">JavaScript Errors and How to Fix Them</a></li>
</ul>




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